And say, ˹O Prophet,˺ “˹This is˺ the truth from your Lord. Whoever wills let them believe, and whoever wills let them disbelieve.” Surely We have prepared for the wrongdoers a Fire whose walls will ˹completely˺ surround them. When they cry for aid, they will be aided with water like molten metal, which will burn ˹their˺ faces. What a horrible drink! And what a terrible place to rest!As for those who believe and do good, We certainly never deny the reward of those who are best in deeds.It is they who will have the Gardens of Eternity, with rivers flowing under their feet. There they will be adorned with bracelets of gold, and wear green garments of fine silk and rich brocade, reclining there on ˹canopied˺ couches. What a marvellous reward! And what a fabulous place to rest!Quran 18:29~31 (SURAH KAHF)
Al-Kahf (Arabic: الكهف, al-kahf; meaning: The Cave) is the 18th chapter (sūrah) of the Quran with 110 verses (āyāt).
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وَقُلِ ٱلۡحَقُّ مِن رَّبِّكُمۡۖ فَمَن شَاۤءَ فَلۡیُؤۡمِن وَمَن شَاۤءَ فَلۡیَكۡفُرۡۚ 
إِنَّاۤ أَعۡتَدۡنَا لِلظَّـٰلِمِینَ نَارًا أَحَاطَ بِهِمۡ سُرَادِقُهَاۚ وَإِن یَسۡتَغِیثُوا۟ یُغَاثُوا۟ بِمَاۤءࣲ كَٱلۡمُهۡلِ یَشۡوِی ٱلۡوُجُوهَۚ بِئۡسَ ٱلشَّرَابُ وَسَاۤءَتۡ مُرۡتَفَقًا 

إِنَّ ٱلَّذِینَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّـٰلِحَـٰتِ إِنَّا لَا نُضِیعُ أَجۡرَ مَنۡ أَحۡسَنَ عَمَلًا 

أُو۟لَـٰۤىِٕكَ لَهُمۡ جَنَّـٰتُ عَدۡنࣲ تَجۡرِی مِن تَحۡتِهِمُ ٱلۡأَنۡهَـٰرُ یُحَلَّوۡنَ فِیهَا مِنۡ أَسَاوِرَ مِن ذَهَبࣲ وَیَلۡبَسُونَ ثِیَابًا خُضۡرࣰا مِّن سُندُسࣲ وَإِسۡتَبۡرَقࣲ مُّتَّكِءِینَ فِیهَا عَلَى ٱلۡأَرَاۤىِٕكِۚ نِعۡمَ ٱلثَّوَابُ وَحَسُنَتۡ مُرۡتَفَقࣰا
There is a hadith in Sahih Muslim that states that Muhammad said (Concerning The False Messiah, Al-Masih ad-Dajjal):
“He who amongst you would survive to see him should recite over him the opening verses of Sura Kahf”
— Sahih Muslim, Book 41, Number 7015
اور کہہ دو کہ (لوگو) یہ قرآن تمہارے پروردگار کی طرف سے برحق ہے تو جو چاہے ایمان لائے اور جو چاہے کافر رہے۔
ہم نے ظالموں کے لئے دوزخ کی آگ تیار کر رکھی ہے جس کی قناتیں ان کو گھیر رہی ہوں گی۔ 
اور اگر فریاد کریں گے تو ایسے کھولتے ہوئے پانی سے ان کی دادرسی کی جائے گی (جو) پگھلے ہوئے تانبے کی طرح (گرم ہوگا اور جو) مونہوں کو بھون ڈالے گا 

(ان کے پینے کا) پانی بھی برا 
اور آرام گاہ بھی بری 

(اور) جو ایمان لائے اور کام بھی نیک کرتے رہے تو ہم نیک کام کرنے والوں کا اجر ضائع نہیں کرتے 

ایسے لوگوں کے لئے ہمیشہ رہنے کے باغ ہیں جن میں ان کے (محلوں کے) نیچے نہریں بہہ رہی ہیں 
ان کو وہاں سونے کے کنگن پہنائے جائیں گے اور وہ باریک دیبا اور اطلس کے سبز کپڑے پہنا کریں گے (اور) تختوں پر تکیئے لگا کر بیٹھا کریں گے۔

(کیا) خوب بدلہ 
اور (کیا) خوب آرام گاہ ہے
This Surah was sent down in answer to three questions which the polytheists of Makkah in consultation with the People of the Book (the Jews and the Christians) put to the Prophet. These were:
Who were ‘The Sleepers of the Cave?’
What is the real story of Khidr?
What do you know about Dhul-Qarnain?
These three questions and their stories related to the history of the Christians and the Jews and were unknown in the Arabian Peninsula (Hijaz), so they were being used to test the divine knowledge revealed to the Prophet. However, God informed the Prophet of the complete answer to these questions and also employed the stories in the conflict between Islam and unbelief.
The questioners were told that the ‘Sleepers of the Cave’ believed in the same doctrine of Monotheism (Tawhid) which was being put forward in the Qur’an and that their condition was similar to that of the persecuted Muslims of Makkah. Also, the persecutors of the Sleepers of the Cave behaved in the same way as the disbelievers of Quraysh towards the Muslims. This particular story was a warning to the chiefs of Makkah, who were persecuting the small newly formed Muslim community. Additionally, the Prophet was instructed not to compromise with the persecutors nor consider the chiefs to be more important than his own followers. Likewise, the chiefs too were admonished and informed not to be distracted by the temporary life of this world but seek the eternal life of the hereafter.